Check that the equation below is not exact but becomes exact when multiplied by the integrating factor. xy + x(1+ y)y = 0 Integrating factor: u(x, y) = 1/(y). Solve the differential equation. You can define the solution curve implicitly by a function in the form F(x, y) = G(x) + H(y) = K for some constant K. F(r, y) =|